Quantum key distribution system and method based on interference ring single-phase modulation

Abstract

The invention provides a quantum key distribution system and method based on interference ring single-phase modulation. A polarization beam splitter is added to a receiving end to decompose signal light into two vertical polarization states, the interference under the respective polarization states is completed by using polarization maintaining optical fiber interference rings to obtain a relatively good interference result without using a polarization correction system, thereby reducing the production cost; one phase is adjusted by one interference ring, the requirements on the used DAC and the analogue amplifier are only 10 to the power of minus 6 orders of the existing manner, thereby greatly reducing the requirements of the system design, the modulation on the light signal decoy state of a light intensity modulator and the selection of light signal phase modulation by the light intensity modulator or a light switch is also omitted, thereby further improving the key generation efficiency. In addition, the interference ring made of a planar optical waveguide is adopted, the planar optical waveguide has polarization insensitivity, and the waveguide manufacturing process is very mature and can reach a submicron order, thereby better improving the key coding rate of the system.

Description

technical field [0001] The invention relates to the technical field of optical transmission security communication, in particular to a quantum key distribution system and method based on interference ring single-phase modulation. Background technique [0002] With the widespread popularization of the Internet, information transmission among human beings has reached an unprecedented quantity and frequency, and various private information is increasingly exposed on the Internet. Therefore, human beings' demand for confidential communication has also reached an unprecedented height. The current Internet information security encryption method is called "public key" cryptography system. Its principle is to generate a public key that spreads on the network and a private key that stays inside the computer through an encryption algorithm. The two keys must match Use to achieve a complete encryption and decryption process. [0003] The encryption standard used by the modern Internet...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a quantum key distribution system and method based on a waveguide interference ring to solve the problem that the quantum key distribution system in the prior art needs to add a deviation correction system and polarization compensation technology in order to improve the key generation efficiency, so that the system Technical flaws that increase complexity and increase production costs

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